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x in (-oo:+oo)
(2/3)*x-9 = x // - x
(2/3)*x-x-9 = 0
-1/3*x-9 = 0 // + 9
-1/3*x = 9 // : -1/3
x = 9/(-1/3)
x = -27
x = -27
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